linux-kernel - [PATCH v2 2/2] media: i2c: imx219: Balance runtime PM use-count

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Message-Id: <20210311095205.8095-3-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Thu, 11 Mar 2021 09:52:05 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Pavel Machek <pavel@...x.de>,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: [PATCH v2 2/2] media: i2c: imx219: Balance runtime PM use-count

Move incrementing/decrementing runtime PM count to
imx219_start_streaming()/imx219_stop_streaming() functions respectively.

This fixes an issue of unbalanced runtime PM count in resume callback
error path where streaming is stopped and runtime PM count is left
unbalanced.

Fixes: 1283b3b8f82b9 ("media: i2c: Add driver for Sony IMX219 sensor")
Reported-by: Pavel Machek <pavel@...x.de>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/media/i2c/imx219.c | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index 82756cbfbaac..49ba39418360 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -1035,37 +1035,47 @@ static int imx219_start_streaming(struct imx219 *imx219)
 	const struct imx219_reg_list *reg_list;
 	int ret;
 
+	ret = pm_runtime_get_sync(&client->dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(&client->dev);
+		return ret;
+	}
+
 	/* Apply default values of current mode */
 	reg_list = &imx219->mode->reg_list;
 	ret = imx219_write_regs(imx219, reg_list->regs, reg_list->num_of_regs);
 	if (ret) {
 		dev_err(&client->dev, "%s failed to set mode\n", __func__);
-		return ret;
+		goto err_rpm_put;
 	}
 
 	ret = imx219_set_framefmt(imx219);
 	if (ret) {
 		dev_err(&client->dev, "%s failed to set frame format: %d\n",
 			__func__, ret);
-		return ret;
+		goto err_rpm_put;
 	}
 
 	/* Apply customized values from user */
 	ret =  __v4l2_ctrl_handler_setup(imx219->sd.ctrl_handler);
 	if (ret)
-		return ret;
+		goto err_rpm_put;
 
 	/* set stream on register */
 	ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
 			       IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
 	if (ret)
-		return ret;
+		goto err_rpm_put;
 
 	/* vflip and hflip cannot change during streaming */
 	__v4l2_ctrl_grab(imx219->vflip, true);
 	__v4l2_ctrl_grab(imx219->hflip, true);
 
 	return 0;
+
+err_rpm_put:
+	pm_runtime_put(&client->dev);
+	return ret;
 }
 
 static void imx219_stop_streaming(struct imx219 *imx219)
@@ -1081,12 +1091,13 @@ static void imx219_stop_streaming(struct imx219 *imx219)
 
 	__v4l2_ctrl_grab(imx219->vflip, false);
 	__v4l2_ctrl_grab(imx219->hflip, false);
+
+	pm_runtime_put(&client->dev);
 }
 
 static int imx219_set_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct imx219 *imx219 = to_imx219(sd);
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	int ret = 0;
 
 	mutex_lock(&imx219->mutex);
@@ -1096,22 +1107,15 @@ static int imx219_set_stream(struct v4l2_subdev *sd, int enable)
 	}
 
 	if (enable) {
-		ret = pm_runtime_get_sync(&client->dev);
-		if (ret < 0) {
-			pm_runtime_put_noidle(&client->dev);
-			goto err_unlock;
-		}
-
 		/*
 		 * Apply default & customized values
 		 * and then start streaming.
 		 */
 		ret = imx219_start_streaming(imx219);
 		if (ret)
-			goto err_rpm_put;
+			goto err_unlock;
 	} else {
 		imx219_stop_streaming(imx219);
-		pm_runtime_put(&client->dev);
 	}
 
 	imx219->streaming = enable;
@@ -1120,8 +1124,6 @@ static int imx219_set_stream(struct v4l2_subdev *sd, int enable)
 
 	return ret;
 
-err_rpm_put:
-	pm_runtime_put(&client->dev);
 err_unlock:
 	mutex_unlock(&imx219->mutex);
 
-- 
2.17.1